Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37a04df0019ef6898da28cfaedc96ae4792f87b3898d2d63adaa1860dc39599' 
  AND token = 'vVBUY1bUApbgHCndTfnAia3+G2o8+SAH0FvcZDxeaug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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