Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fb276d7c52d25adfc7596fc75ea8bcd995a49f0397f0c05681505b8408922a' 
  AND token = 'tdYrIcTQ75TMDUEPCbtDhdEjVvrWEVbtUKviFWWLtl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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