Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34758f958bbd69bdebe197477c06e9023a0d41bce1112c642881e272db9db77a' 
  AND token = 'MfUrMI5syzqyMv9ZqsAmPXKh7w7gS7MLIh10tSFnxqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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