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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56a5a47e6fbb6de73bafeb6c312269bb4fa9faa499ba2d8f1750de7172ed970d' 
  AND token = '4d2+2ziR+MA0i5JcbB98cZuavizt8hdK2JVtiGy3v20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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