Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44cfebebbdec7164018144db53a6df0b5f7144ed073e1814a29e8442744641f3' 
  AND token = '6kr0CwMQNSiAH/FZktYymIkBbdDskNaXGJPrY22vpts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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