Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8dae77ceb84941a067ee3b505691f799a293f21f70e9964dc8855dd35bc967b' 
  AND token = 'aVkRy8OoRGQXbEgxE9QCZD5mb40r3InqZV2uQ9aVnhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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