McKeown failed to rival for a medal place after completing the race at Brands Hatch in 24:44.37.
"That was tough," McKeown told The Guardian. "I can be quite a canny road racer. I'm hoping we can take out some of the sprinters in a breakaway and see what happens."
Meanwhile, British silver medallist Jon-Allan Butterworth finished 12th in the C5 time trial.