Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '44a3e7b02f4ff370bd2dd43c91ace877ee6b19f0eb8b97cb5d56191ec6d171ce' 
  AND token = 'YJVWJ5za163gN7soKvu6ln/JSTklyZ2Wrj9a0nSxccw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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