SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9b4dc02bb3f055d008674e618b49c0d0267faff4e192b5391652b94ceb5e6032' 
  AND token = 'WvmYUQdbXDlYpqq23XeCzlPG/6ZiXVjcnohUHI/QS1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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