Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed1252c83abbfde803dec1f1a693687e152510e18ff925884bac71ff0f43f56' 
  AND token = '/Q2MRukUiDGf6BEMimRvbusDYzXrQMz0wZoSP3at4bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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