Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f173bd12a558d4fe760360dbbbcded0aef9da254a9fc559f416ddf90ca3ece' 
  AND token = 'LG60hQG9ei+8pUjI4CehmBFn+WkeW0jqDlXuXtYqxFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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