I don't think noise-cancelling will work. Clicking noises are difficult to cancel. You need good passive protection, shooting range earmuffs may be a solution.

I don't think noise-cancelling will work. Clicking noises are difficult to cancel. You need good passive protection, shooting range earmuffs may be a solution. I don't recommend the active ones though as they are designed to let voice pass though, which mean you will still hear your coworkers yelling at you and your <censored> keyboard.