I too have the same problem. I read that if the site was active before June 22, 2016 (this is my case) had to work around. But is not so !! Can you explain me how can you do?
you’re editing something on visual composer to solve the problem?
Read here Adek: https://www.latecnosfera.com/2016/06/google-maps-api-error-missing-keymap-error-solved.html