SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a9b0be64079226482ef4f8def988917d76a072bbed9833cc3b1918624ce34850' 
  AND token = 'UiU+hdsK5QccPfiX3EJxEymhXbZpGaZqSkeAGN5tjxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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