Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a7f9ef4b6d3566eceb624ef8906bc01e24100d57f72da524c9d5bc031ce6b7' 
  AND token = 'RoAverfsP8w8gVtWp0lHnpbxXy/QQSRePmoMREKi36o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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