Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2503a36fde97667b0f55a13255b738953b1fc73d742ef40b7be97ec07db3e5' 
  AND token = 'z6KKUpl0MXH7E7nXCzYmhf72doHXAKki9Ixy0uWltFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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