The story was in an anthology comic book, possibly something like Tales From The Crypt but not necessarily.
An escape stunt artist reveals to a young man that the secret for him surviving his dangerous stunts is a magical watch he got (he doesn’t tell how) that, when pressing a button, tells the exact time of the user’s death to the second. As the performer’s moment of death approaches, he hands the watch to his sucessor and promptly dies. (I don’t remember how “freak” his death was.)
The new user presses the button and sees he’ll die in 79 years (he's in his twenties) and takes up the same line of work as the previous user. But he’s reckless and doesn’t care about the safety of bystanders since “Hey, I won't die!”
Eventually, the father of somebody who died at one of his shows approaches him in his convertible and throws a bomb in. He smugly says, “HA! It won't go off!” Cue KABOOM.
He finds himself in a hospital bed, in excruciating pain, armless, legless, blind, totally paralyzed, and knowing he‘ll stay like that for 79 years. He’s not deaf, though, and hears a doctor talking about the weird watch that miraculously was unharmed by the explosion but only shows a time of tomorrow, midnight.
I read a Brazilian translation, the title was “O Relógio da Morte” (“The Watch of Death”), but of course that doesn’t mean this is the original title. It was the late 70’s or early 80’s, but the USA publication date might have been much earlier.