Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326f46e7accf944cd08621274d92681f267939e97cc76bc638a34fd88b73c590' 
  AND token = 'u3XkitWlx9lGnTVb7BIiI/cH7XsMmMHdqDIeHRcNipg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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