Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec557c11f97917bb81e9f13efee7fc862bfe3c911817167c9d1f11ad10993526' 
  AND token = 'fkYUOrPeMe+adS7lqB6FkD6sP4REKSSdA3AzfrtdGjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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