Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a987e96139cbacea372a8693e6df09a25f990f348085d1aa396d6a259eb776' 
  AND token = 'lPNNoQpq8Wtvl4KBqnoeBc5kJUjMkdZlPmGfxfk3msE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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