Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450ba42f52d45aa875a2cae4bb1d51acbebba873ec5efa32be4f608f380c2eee' 
  AND token = 'yx5v2Ru6JEvVNygv8n5zM6eaVDGvdXn9+nJje9iHnDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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