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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0412f8721190c3ba8c679b9a247abc8cf84ffbd848765e840eb1323ff55abc20' 
  AND token = '9RUk9jw7RKhhnQzzIn1A8uIrhbh8bXdTtM5qAEY/KWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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