Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b731d4480baf8f43b661671a612ad941031c6cbf43bcbe7e328f2b02404b5a30' 
  AND token = 'BJzbMJPUbNXYycAex/7815qZ1P4xA7Uo3BTYVJSca/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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