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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a89de93a906a11f8a6f3dadcca8292893ac9b19a2eaebfa1a1db7d5e7a48a675' 
  AND token = 'sTmzNgGXe1tTa2TBcFoYZoqszGCx45YNA7PT/tR1wtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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