Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd876e648abb7b305325f0a22ce5e4c45480354e636aad4cf0dddf7b16e2aec96' 
  AND token = 'XqiBIFyQwGDNfw0nKB0fjDuxvYt3BJndEEycjNvf9to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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