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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '914c979f6a40e57cc3d4c2580f24f92ee65c602c1367ef48d8a5bdbc22e7de10' 
  AND token = 'OQaUQuw4l5fwDhJ+GVfLMQLL9TSfO9dRhMQOz2i8tks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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