Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71f1589c93f8c91fc4eb9edaf1fc4ab42e6cefe2e6fecadbfa8cb7e1c81000a' 
  AND token = 'Givf0wwL8sAqdxgRWPynLGA6U5pGUEkjw7RdOhcK2BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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