Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '442f206edfc88a00da8b405341dead0b628927c4ee94aa808648f30c90b73a55' 
  AND token = 'YdD0Vk302jGk53TQCbhse4uYFts1REzwBGUMYd9OR3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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