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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e6d730c19b221b24e1226bd02061e9a6b8834a87f62e3f1c6de1f647ba868b60' 
  AND token = 'xdUn+yeLlKb0ybzO9XS+5QrFkHfjIMdgtv3q9YNx2zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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