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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fff0216951119d1344318e3b4e0c6266487fbef4a600682bff3c7726d2311b9d' 
  AND token = 'yQYEZKwl71zBatE6xqj8pina0zU55FFZeR5kmiUzd+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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