Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82dc8b9152315acd10b09fe034ffec2ef927b705ddf626cd7e9d6f2d27f31b5' 
  AND token = 'AG1xmJKBGxkfrtDPVKtqw1w8lmdQ0HqxKJg4Uy4fvr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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