Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc607fe8cea870a83a0e22b1904d84e149a4b12b721aab02fe878b4648fd21f' 
  AND token = 'Zgjvdu2mY4N2ijUUerFrzoZpjTs4cLz6DNN49de92AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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