Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474bd7d52564bed7f082c8e665439800d5827d215cbe992818a18ef00c94061d' 
  AND token = 'IkapSg/XVMFKF5iuAwelt9bIvyMDC64zpaWkbUGXcwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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