SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b0a42d832ec70537b4147b5594f252d9bd2ff23fc73c18bd1726603ac55d2901' 
  AND token = 'UxbzVanqvBbhPjsoUnBLZUPfxM4BZuMwa1gx4OupwCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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