Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8bb023b5b6d6cc1d40f35b28297ab2c1781230deb431ba348a57f952f24207' 
  AND token = '9azrXVfoSkX4CfsZ2pcevbm7KNfAQ9y+qRLlJjOW0IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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