SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e8f8be057571b797acaf8f8f6687246272d56a7a30edc0b357d9d06484a87281' 
  AND token = 'pnWunxpYo5TTX/8vz0TemkYhXC34dWewGFDzzYBQzpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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