SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '079d0e6a9539d9974b25d450088f4e7ff459c97dafad02a59209319e956dcd92' 
  AND token = 'Y+zAvOhk4xCOfxp6piKnJW+2Z3/nsKqr3/mYALGT42o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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