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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'df935e8e819e35cdd0e658d07c532af5f6d562531c79725696d03e3f7c5a3ce3' 
  AND token = 'nAjJfs0Jx9OZXkObxJ/g7F1V6KV9HwXnhF1biks+IjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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