Both KQ and KL are handled by Menzies in Accra and there are a fair number of connecting pax off KQ's FNA/ROB flights interlining to G0/BA/KL/SA.

When you get off the aircraft and head towards arrivals, you will see a stairway on the right hand side labelled "TRANSIT". There should be a Menzies agent manning the transit desk there. Collect your boarding pass from them and climb the stairs to the security checkpoint. The checkpoint releases you right next to Gate 1, which is where KLM departs from. The whole exercise should take you between 8-10 minutes at most.

I've managed 15-minute connections at ACC in the past, so 60-minutes is definitely not a problem if flights are on time.