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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53d099b6cbea23a8c60a9d7f2c488cc56271dacadaeeaecf633e3cb982d2c785' 
  AND token = 'M4xvybjrnzcvNuv+byS5rW3IZKhARNv2g7N7etLCEBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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