Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ce0105a368e1776a21902d1d37c5606e7bb049c3646378330ce637ae7a752e' 
  AND token = 'Khe7DH4Kv+7NlBUSkknaSxCheS4XUx9oBwnDSulF41g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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