SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f5c0d4f450be5f3b9ec3e2e0dcf0851d96c4bd4b6bdfd56c233cab122501b9d7' 
  AND token = 'Cw8qsiM3/EiEeWHQ5+MthKjQvQZVSmcZ2VtyyIYu+tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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