Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc53217ede89d26257f509ed91da4d50a1b11bbafd7f7e2167995de0b9ee2e3' 
  AND token = 'MKlkvHObbZQRjJZPKHx6YW2lX7Dg2O8QECE32H3VTIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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