Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a15b1e0a1c4188e706789745faf0c156ac15af4fb92a5073f24dba65377acd89' 
  AND token = 'lUbZD7wDkdUwzXoE1BZHe16ZH7nHxlYxUjaixQ4q6uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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