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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f72972b00b2aeebd6d2ca12fa644bea8f96c17e250d94d6e0889bec5ed325a62' 
  AND token = 'AAkU9fINSrJy/dXJAxOx/Vb72StZEtYXgvwqpme1tSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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