Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78345932c2c74c147c1d27adfdcbbdf49216b579a4cb30e0bbac449f75e66d46' 
  AND token = 'cmbvJbsuCQt6eT2v+nqDz5eZtBUSn8RJolQ5sKSo3VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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