SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '161cb1a369041cea24d06ad0abf0de2bc89fe759b037f428434e5640ec1b5255' 
  AND token = 'tm9lVOvuXR3j/GwfNbAqXsrX+LLCr1bMCh5jEaY4WRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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