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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd7a615d35b4adcd191caf398f916cd7257ca64eee0dc68e3c100929dff5f3d28' 
  AND token = '6tBtFBSSrio4Y54f1USmLlUuA2bm3mqDZdBIjvfzlc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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