SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6384078adb8d5a25e224f1f00b1a3bba311861d3b104a23d1959355c430652b5' 
  AND token = 'xQKId4xoH2/xhyUm4sPOBzg9Vlz4Sa8AikNqL0RXw/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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