SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dac90fd68acdb4b98de8454775b79e3e1af8fa6c5fb1131ee440e73af8f926ab' 
  AND token = '+CZKfpRmiqRicgOF5NLz0ccsLR1KQEzx6z/JKyBPkyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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