Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b83fda1f38283d0f5e786fe83921edb9444d8ba788493c6617fb0d04ab285c' 
  AND token = 'QLG042ScLCdPZWBxYbZguprmYnpuY1dTZqxuEdvYRvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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