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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5facec3a51655b89259dc6e06b63c7b6644de31b6181a499d7d684cea0d6b8db' 
  AND token = 'nXGWeopY2kZlwB73eb/7CaZF+TEz9qPpC060DwiAaRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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