a 60c bet with KJ high on river is the nut worst move you could do.

You won't even bluff him off Ace-high with that sizing, and your hand is decent enough to win at least sometimes. So either bet 4/5th pot and hope he folds Ace high --> bluff, or check it down. I'd check it down.

60c would be a good sizing to value bet with like 22-33.