Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76147ee923697de20780f1f93c5f2b3f2fe8204b5ee22f14e80dfd7844973e80' 
  AND token = 'Ud4oq+QEiQ38Sf92Oz5LFu8PgQmm4tYzRAn4VfavDwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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