Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7857dae5825b955f0a20387aac596f7270830a85acf5328bb8de7b1b5584bb66' 
  AND token = 'U7np+mQT/nvmbyc+BCYxiMoWERIBvigl76eGjIlrN2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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