Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0828e4014ae950c278ef50622c9689a3d2c8db14acd76eee1423632b65bf46b4' 
  AND token = '0h9tR651IJiXMBwLlXHdZUux5m1YFhyOypcNmXOVb50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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