SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8f56015cd7254502d8263adf204b948b646ced3e8c332a888a53594f62d30f10' 
  AND token = 'xjEKjGltZyysJVbj6gX3/msNIZqRjKst6Wkkp0hEKKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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