Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bcc94b2425eb71ed40662cc3e6a7881bc2d9804a7ea499ebfbbb5e747725db' 
  AND token = 'xRSeO7eNwHft2HBoqBhYx3g8OqLzTOL1y+gglgR6IcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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