Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7374033128510887b2a9af321a06d374767c4f5ab9678c17116d9b4d9d92f270' 
  AND token = 'z1kVnI75nxxFGddtgRJrsP5LDHJqnPlztbRKTtrb2MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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