Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443743af341f12e30b295ec4cff2d61f02c9609e1a439a8ae013559ccae28f2a' 
  AND token = 'FyoWeIntCwf+qRnjqxo1ZZ1JZxJrVO8XMp1Eyp5DwWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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