Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8356fefc6c535185ab2f63edd9e6209a3f2ebe1ac2fd7bf42081d535646320f5' 
  AND token = 'C/bwseEumLzrDgPIopRaTTP8BAL602RQFE+vSbmj8A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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