Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6299f28fa1ecfdc42b1dfa3e391bfbf90427b3ecd4187bfdaa8c5664ac9c7a' 
  AND token = 'au1x4p5KCWaFvmM19oJnhq7+X38utgYvCbzPwmF5af8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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