Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b4c555a062bfaa025abf98b7d1d02cc6fa694f3ab24f49ed4495a89c67abbd8e' 
  AND token = 'Qomf8tecXMFfcQXsZn6VKmQa2bW6ROKaLwa7e3sBQj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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