Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7bcc8c9b3e821b6e5d36aea381037ac3807e4daa509adf85b97b1682079ce7' 
  AND token = 'c40AOK0SfLSQpjIWyArhlBhgjAyXw/hplE5YXFrYmwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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