Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76fd1b76d3b35dc7643d0d23f57dd71263badc0a8c1639a03b797e039fcb171' 
  AND token = 'De8TejHlwI8ibKDMstZiICA6UaXVUDq5Jq9Z9fGt3qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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