Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee96842d581dd853c5cc3fbd9fdd3dbebd59ba9e99421b2498ce9f041cdd395' 
  AND token = '5Gt7IbWC7cYz1WxnhijcL16ku+yAIv05yQKigxEfR0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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