Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9c510f33a607f647ef0446dfb329e9946ac5e07a46c351ed08afa42982ab9f' 
  AND token = 'VHZXJzUAuuZRzfGDLC6Hh/ZTTgiN6JU8eTCaen6AQJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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