Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d91766c9e0e7fe3cd273d697b9bd2d70f4425f77649adf48ec54123365a996' 
  AND token = '06m/zsDvRTCtXfqa9/UUTsNZPgidhSqsuaUmqjHUkGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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