Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d184def7b013d7d27e9a06bc3242af60fc00e02063a6ff4ef23ebb8be0d1a3' 
  AND token = '/bchYLJRAe+2XREijpZTKvedGIgeo6nNK+Z8Ggr/n9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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