Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7c802136af3cf55e8cd783cb60f6b7a8c48e9f2c9328bba2d5920f2678bfda' 
  AND token = 'avNPvb5zzvkB+GeAO6DYgxT0XhkGS9WR0LvYPbrH0mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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