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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd0d6e4db031ae89d30e1d758aa3b5522d11c3749e9859b6a84bfb638c5b1f6fc' 
  AND token = 'CRTQyO9oHKhHo31Tj6W03Q1+7H4EkXhbbOMhgc8Bz/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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