Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bdfc1d9d54e40fc933b40ad255d3d7631bea7bf7df472ea18bbb07b35b6a73' 
  AND token = 'UjrP30oVQTgMzplVaFePrZZyUT7So5s6LWzqPk0XWcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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