Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d9ffd6c87e4dd4952209d5e87fea4258ebae7a099d026cab4ebd3d9d6fba34' 
  AND token = '5yaa6cK6UJ20oysOPDHPyuA31ohFcR+bP0sKDUulBdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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