Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac7fab8ccf54513fcec5bf6f6cbfb7f319561f697e7480bfe5b067fd56d7c05' 
  AND token = 'JhB+A5Xyv9D95Hl+dYBe1gM8pI7M+CiXcSEem9uC90o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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