Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdcc0d91399f314ac0da76fdf4981dc93d12ae08848cedceb0b92ec5bb69761' 
  AND token = 'OMfCGpEBaYjU4XVAtJEOEp2v16e06bj+FXwB+aFxKLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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