Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b49ef2e1722c334b216f91adb7f7d9a8ce0deedb8ce4af2a36fee34a390ab2' 
  AND token = 'lj78vYZoJzO750tiC/6CFsckfI2o+BxfB04aiVxIhdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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