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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '40b7ff3b59ae915159378e70659adc1416ad5804eba2acde17d57de74a43ca50' 
  AND token = 'Cuv55QthQgbs0VlyIzoAe7cStVdFOUPD2P7j3xRuqKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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