Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5373fbb8fc8825b4429452a97575fda35bfb2612710fc5eef63e3e0b0d99a485' 
  AND token = 'idFXP1qJwJOpTp4NF7cUdP0z9xp07mVhn/axVMRyRfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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