Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d90d292b3d674c1687de7c9c0e270fa1889ba7a8a10d3e40672d86da347c65c' 
  AND token = 'KWq27nKapyMblQynoBTe/VmRteOUiQS47HriausPNQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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