Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b405ab5c86a14e2b898054bdff675fd6ce17c5aaf824fbfdff48972ab4db9b67' 
  AND token = 'vfVmXHL2M5SvYxD3eHuk4H5w80xfcV0t3ozmrlOnk8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}