Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f76dec97897e6dc3f9a2c4ff5c6560dead8b4187ace647f0e3dcc758b1dfd68' 
  AND token = 'dkw839bXEjRfB6CaJQN+AzHd1CJY7s/kqhCp9Q8K6GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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