SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a58d4394d09fd5088d67bf73c48679fbc3c176c94a260527e96db651a779d834' 
  AND token = '057ZtIO9EcVBzMvAjnDRuaFjv+2HXJSHKlkR0aKc3Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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