Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2be0ebd623811ab3a9fa0857828a80ac7fff179a5c17305b2a8805b40d33e3c' 
  AND token = 'Oc3hg6ZH+dGFMKvnojFFwScGdhKcem5lAkQQfGDIbfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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