Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d6b12e1d74d061fe056849f176c1340c4ff1304b36d8bafdfcfccf1d01c610' 
  AND token = 'nS36QFYdMh2o//pkArgTilgsnEJvMX/3ov/++PVLLqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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