Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f896f21047e481fe6212d8fb9a0ac9401739562c90d266f6b885384fdc2fbba8' 
  AND token = '1FBZaL47ze1nW4Do0FQTKWkcXd16osKObJV3jaBgfRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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