Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39c0adb644e77419762fef7d5530710ce8a484884ddee5e9350ccbb47f7a340' 
  AND token = 'MG4BIy3VXvVMIP9yug+86ja3TNJiLLPTMiDfj9eRx6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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