Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cc29bd6d76a8bf7ec66675d5106d6a342a8e2373e21359ddeb8b20de3b2e6b' 
  AND token = 'aHWYzuZerPr2t1nROBGTAzMruTn53SMLiwQL2IH6S/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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