Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2fc708936de423b77fb81b757b8283a2eb00450fc2b94dfe50e86278333d93f5' 
  AND token = '2BZvnqUHwh6eeNPPtFbu4PmUM9l7Fedq33cU7+tGt14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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