Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbfbf99194bfb896d9ddd2f49e4ff4ff50c18d9e2033ab6d03203a3f9ea9f2b' 
  AND token = 'rDcrTVFyiQEJpfJW++iEWMXf7QYkzLQr/9rqe7brwP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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