Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d36433ac62b77a6bfdc4887e40e6daa87699be4270091dce9d64d8d8caa273b' 
  AND token = '88osrOksLqvFiLrjhJDsM8PyCfqF/Mg41i7afSSCASw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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