Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4935365e76d6fe84385df58195be8303dc352c48b20bc8f48a75819aa649ff84' 
  AND token = 'gevzQ6ZRM33aAkzcMn9DLkPtWexyQj+dSfWd45nLvb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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