Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc956ee712f3076856f0e91fc96a4de695e9097c4ead264f4bc7f442ab8b362' 
  AND token = 'mhuGJMLlnlOvd9RMYuXSpIJLSNGnsBbmoni4ZcK8S3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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