Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f959791b2fecbff366b40b21bcdca6ec740a726da2d9ba08cebc2238d24c45d' 
  AND token = 'voGgRRftchRGwAFr2TJoIz8COZWrvU6cbB41dwxPcII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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