Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b13fc56858a7e86c3f804bf6455d2f4915cf9f9fb19264aebbec467f63bf85' 
  AND token = 'eK9QDCpcl9Xyath+7w2wZDRrvHcVqeIIJeZZjmRtM0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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