Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d5f588c5b8e882cff127e5a65f0bc5b382e4cda3034c6c09003ff6247ac757' 
  AND token = '6ImBSx4eK6QmPynwovb16w0XRRxaizkharAQT6pUXRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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