My layover in Guangzhou airport is 5 hours. did i have enough time to go to downtown by Subway?

I'm traveling from CGK to CAN and from CAN to Haikou on China Southern Airlines. My layover in CAN is 5 hours. Will that be enough time for me to visit Gz down town for 1 hour by Subway?

Or can u suggest me the nearest sightseeing for tourist that I can visit?

What trasportation do you suggest to go that place.

Thank u in advance.