Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2884209f7f81950d128a47ce9032a573d281788a8264699d9ab1fba0fc274420' 
  AND token = 'fIPnQT6/IhCrRF46uM02RSUMlVtlgafG2JU7tjo7uf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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