Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03eb9ed0c3ba025602bd3efc1ba5e04033cb042d5332abab37a796c7e32dfa30' 
  AND token = 'IEPo3EWxx9QrxHtYeL0DZRvQBVnyWY0nI0YV7PS4fDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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