late chek-in at Naha Airport

Hello from Austria (NOT AUSTRALIA)!
Do you know how late I can check in with my baggage? My flight to Kagoshima is at 7:25 a.m. but the earliest train to the airport arrives at 6:30 a.m. The ANA website says the latest baggage check-in is one hour before departure — is that really enough time? If not is a taxi affordable in Naha (5km)?

by AdClean8645