Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76ba91850f1dace4794392407b85a6edaba8818eaf2db2d097b797e183b80af' 
  AND token = 'ul4iMqzD4cpYlI7km1lrEXHuIBoxzl06EtEk8hGgq5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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