Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce301f5fe4d4331b56a9297d564ca06ce9f51b5c1fdad5dc5652b935988bb1a' 
  AND token = 'OK4KqdTfHHGdZ/Za2HljiM+3VjKFxJEDAxQPxa5qQmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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