SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae7065c08553df1abfacf0e6b481b22758dd31a0465f1d48470758255dc777f6' 
  AND token = 'O8mD4vVO+4j+HH2SWmBGy+ofDQ98Gel5s3iMYk+ahcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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