Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dc80998a4cf48be0771311ce899524d6bce6e6119520f3d025d9ba95306e42' 
  AND token = 'y+qgVF0UOQ5B0poftRUIuFzSSfCzR950/am70zd+ej0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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