Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2973fc3adbfa19cbab3554d48d744cb5d62fdeb2d8110b1468ff0e4bb1fa2e88' 
  AND token = 'N3uQNwEiWqRH8Vh9Fl2TSYLFsrHg9eOsLPz5IhfLkO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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