Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7000933284104c6064945da477c73fdafaf814d7b7cb42df4ccdaf6bd5808f' 
  AND token = 'xNhVv0Ec/iG70lR9diE4XOlywCehJEkAYM1WuJXV+mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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