Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0355a324ac611ada280b393b93c2d94d2a7f232dfe3d3f651358109b038edd4' 
  AND token = 'HXAKAE8ovVDnA1ppbrMZhLo6RdtgoHhKB7ysiNMakfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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