SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '012590aba7a5fca5bdac1de62d5b485648549835f6ae929957812b3982b50cf5' 
  AND token = 'uKBOjFovLY+CYclvjKsTjVc6ieBaNHCJezv3ynp4IbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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