SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '08f24874f55d13d80d20174fb8dcbf0657c1889450f17d65d6570ea16ef5ff64' 
  AND token = '0RLwnnua6h/m+hBaE4jKvcADqPcx0Mg4R5S2q+lIFo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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