Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d68f8b685c4fa7e13f5d8f7207e366515f29754f2610e45ab04e840229f890' 
  AND token = 's2hnC6n5qO9sH//m5A25VdMFeKOlQtTrz4n4+HsaIpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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