Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc60dc63a7315060dab2272fe3353659378bbdf9c4bce9db38462f950d600fc' 
  AND token = 'U9UaDTc/O1zyIQH9TGs0TrrKHV7rDw7VxEEvob/2AWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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