Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343b305d15bbc428eafd1ee58f0a84e6a0cfd846be7ddb0493abb33782471719' 
  AND token = 'wfz0Jo/NaPu89IblELPRCeC4CWA3zv5eYEN1e1W0S28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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