Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9821f208eb94b30f791780d8708c570e655a9630f9f1d1385cb4828b6e12ed2' 
  AND token = 'uJts8RONh7DZHEiYMw4pvHevO1zco7LHtEYfHfygncE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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