Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7722b887c937960193aac652a8baf04abe000536fa5ccaaee827475a24fffb' 
  AND token = 'tWsyFXzEGX91E3pSh3x/CKDdsHJzM+NtsRIRdUX2bEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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