Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b64b2452c43c2c9fb777e83456806bf9d8bc16a260588a6db427a6d79220ba' 
  AND token = '98JpcuCn6xgL1LaI6xB8EtlRe/GwxccyRDwrHDauN1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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