Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403d000f7879522e943a168cd58cec53116cb10a749a0df644796f0a05f73602' 
  AND token = '8byhfp8LBX9ymlEgGyJ8SNbQ/SNE8RIcryu43nTRrTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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