Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2610b69d5a220fec47b9bed18dcd210997af529038692f3b826f78250e320701' 
  AND token = '757kEiqNgkjr6343k28gRUNe5veprtEyI/JUndpfTgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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