Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'df81ab47e9aab4d65144d4f28141ef6c995f39f479937039a8b04cfc55c5ee96' 
  AND token = 'S8nPao0ihZdMPzwaPUjJTbOlzzF8j5X4W0q7ygLHlXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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