Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fba029a8b17b79540b0e25f6a31b6a924ccf255439b1f7a671ee8b236fede6' 
  AND token = 'EUDTsXNiYzaSgoJH3keO1bldSACtN5rUTVKrVAyKOPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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