Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df4bbad12988bc967f2d344ef198a82bd624c86c947d385a7a04a0cb10b0a0e' 
  AND token = 'DycAdJR4Uxct1J0bO44tWeKFCbbDuN4i31b++/nxU3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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