Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671ca118d69e4123d59600c96080a2619ef34a18dcc1d62ddef4bd5d7f29c176' 
  AND token = 'DszPy6jLXzhHAgtLagZMhIe3XqZoEH5E/kjKNU7/jJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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