Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc51e822d6407d10f345c8716fdcbd8288cba4079c0f8bb052313a36cdb3b066' 
  AND token = '3ZPZU4SECnnITVV0c8AzH37oB/9s3wR+0sFy2MI5u8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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