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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cd8cac81d9a20d4078759049372f49cacfee6ec1f3c38dc5307d89340b9374cc' 
  AND token = 'InwOGI+SHzUVPHXT5sytcmwfHQJ1V1eX7JCuNSwGmXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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