Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581d402715328c4ab2d3603fdfed19b7d07e7e6aa0eb3485af04c815ab4bbffc' 
  AND token = 'AUYzLLpL5goEdViDAjFTVcB7lxOWSk5NJDo+qK0fskE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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