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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '10016909a295340985e18d6ed7aad60e7ffcacb1f9964ee500b4c83aa224044e' 
  AND token = 'D5eIXy5wh6Zhyu6t9THH9IaPgpvkiMjZsi5X/WKOytU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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