Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4974cc89ed180908e1008e20be3c99a1d0622cb5bf63efb14944d90e5d46990d' 
  AND token = 'Lefn0oTzT2tROGw2SWU2YNU9IwepomDlgAR81NtUuqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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