Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efee7b493461528fccd57d3f65b579da4384c1ade35fb40e4a2235ac1cbb4d4' 
  AND token = '25WrV1EkG9MFpgVWBfooQuLNKwXh7VBRIF5ql7omnRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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