Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553d5ab523d804e7a51a029345acd1b6de2b79e049d10e73083df7a1573623fb' 
  AND token = 'fgeh3LNnW4bwlOywhIjNqgsRMIn3t1kwrVGtI4Zy3cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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