Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beae4b72cce7f6296417f5c5fd54b2ab0eba6a8337e0329cc72cdd226baa3f2d' 
  AND token = 'rFhGDKpfhKv2p+MWEAWDiQKecBnPxif9y6GmM/FENoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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