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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1940cabe86e1c8c20f1bdf3241150b3e9d380a70873a3824bca5503a65408996' 
  AND token = '2sCHSHgSvnih79peU6aAK/25Tsh5If3xH3wMySU3TgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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