SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '952e5af90331cfc861c05c67f984bff178fbf372779a9d0df83df0dc91bea7ca' 
  AND token = 'YopoIP/G3gzmZ4zuNsF5vyXrZDTsv6UJGg5ccCcxePA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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