Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15eafeebe780188c6a018403df50111d8c7865f1c4b3bea5c571991779a1dc8c' 
  AND token = '4cWuPdbVOOfbnbPfSVLhORIn22dXQ/ZEAashvt7BPoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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