Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adf835945330d0b5f5cecf02c63dc3a1a12fdcfad4e9b20fa1a0d0fce8067ab' 
  AND token = 'j3l3aXeAa/rbampU7D8qI7N+HoZOeu73DQKhGn6Dr7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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