Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4de6ffc86e178fea092b09e78c1e5d44afc04b797b988a262177e3407ca2911' 
  AND token = '5JX3ged+5627jTjZxpe1qOVFfUp3ZNOuTHrWVtMUryM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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