Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13e1d71b9edee6fe41b4d09383d1d07dfa10d66b1d46bd117cd9b07b0628b0b' 
  AND token = 'wuneApLm1HnfVWZK8G6gLQpLC40NSQ75x3e5i3G5NmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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