Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689e3233628f3774e702928a000cd9ffe57a3f32b0fa23564fd8887e7c8de876' 
  AND token = '7muym8iDqmWjdsxnRhOZhvxA9vAO7VNACv7Ana8IUQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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