Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff52308290070256143e86281a294677b7871486d05bf4e86f8069270e526889' 
  AND token = 'tYhoHHgthLkMr4ABh9WCu/di1YXM3fEI12xjhIZ0obw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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