Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf923e61882cdd650f11ef9027265e871c3a50fd0020eb47573edeb6729ee60c' 
  AND token = 'yKBYZWsbWVWx+/SGM5tY7gEV1uoFybY3dLlaQo2F+BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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