Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b687c0b0765fc2ccf9d586b2a81416ec3490c45ce7e3c39ec336062b8284b8b' 
  AND token = 'ERKih6jzKSQEzOzHEdxh464xWP6EnldxYeCPY1kQLbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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