SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'abcc8e16788690342b6b225ed986e2ab8daff0d0416798d028f15f8b5d957137' 
  AND token = 'UdvSPkHELqRQ4Ft0HcPd1ljiLK5DwpjnBxUBw8UuyL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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