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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6f81b57e9567df36f1d7cd4bf14cd489a27148e4dadc5ab68291a655315373b6' 
  AND token = '6apc7RzaRJpf8lgoy8uYe0m1eGfjCgqJNEZMOwDFEkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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