SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '42f131f5634a7c381f833bbf3417ceffe71d6adb316503504e98fbb789ba8dbe' 
  AND token = '+cYsAB0XoDb1nCqS/kAglqk37Kp+CXxdsJVlZZHpRaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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