Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5323b8eb9c786a9a81981e683424d77497a9ddd3fe5ba1325b70b3e91a1f1b4' 
  AND token = 'xnbFhhMEYvLoHJO15HMQ+PrC4L2bpTEkIUUO4wchJtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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