Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924ef5b6870045d34298338dc161cc7bdb8cdfc7d9d91073a440c22165465a97' 
  AND token = 'ETyC81ypjFl0TS2oClp5LmenTVmFryDg7JoQCbwS7m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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