Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c921036ead9c80668c36cf0d6e7c79a1f0d5648e7097b7ae5f0cce2996f04b' 
  AND token = 'ZA41UWQPx8XZBSyYm2rwODEV8quH7Fo6/L/0Dm/hS9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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