SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f11dcdf4346d989e60c8b353c1f60f06524fd58a2924dd45a95316f84da7ae66' 
  AND token = '5oRk6w2tqujFnoL+xv3eg55YM7I/zKMwOH74Pz0G+rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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