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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f459dcf239b066734d0a74acc27cbb6cba5825efa8dca1ba45e9ce60875cb968' 
  AND token = 'a3TtGugvgq/SnPPD81DuqszTbV76fSn7EzGNlDG8rDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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